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I'd like to do a conference call with my Android phone (running Cyanogenmod 7). I call one number, then call another. Then I press "Merge calls", but the phone gives the message "unable to conference calls". Why would this be? Interestingly, this doesn't always happen. Sometimes it succeeds, and gives me a conference call with a "Manage" icon in the middle. So, why would it sometimes fail?

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Is the message on the phone or threw the speaker (ie is it the android OS that is telling you it failed or a recorded message?) If it is the latter then it is likely a restriction enforced by you provider. –  Darc Aug 8 '12 at 21:58
    
It's on the phone screen, in a popup. –  Jez Aug 9 '12 at 8:43
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